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Mar 26, 2021 Replied to a topic by zzkde › 问与答 › 向文件追加数据的时候发生断电之类的故障，会怎样？ |
Feb 6, 2021 Replied to a topic by whatevers › MySQL › innodb RR 隔离级别下的小问题 |
low_limit_id 指的不是系统中活跃事务的最大 ID，应该是系统要生成的下一个事务 ID 。可以试想这种情况：ReadView 创建时，系统中活跃的最大事务 ID 可能已经存在很久了，这期间也会提交事务（在 ReadView 创建时就已提交），这些提交了的事务应该是可见的。
Jul 21, 2020 Replied to a topic by A01514035 › 云计算 › 学生云服务器选择阿里云还是腾讯云 |
Jun 26, 2020 Replied to a topic by mzlgx › 问与答 › 关于 vmware 的奇怪问题 |
感觉像是 dhcp 问题，你有配 hostname 吗，可能是连上网络后 dhcp 又给你设置了个 hostname 。如果你的 hostname 和启动 Xorg 时的主机名不一样会连不上 X window 。你看一下你的 hostname 前后有没有变化
May 24, 2020 Replied to a topic by lhx2008 › 问与答 › 在北上深，拿着首付吃利息交房租不香吗？ |
我感觉挺舒服的，走到哪租到哪
May 19, 2020 Replied to a topic by brMu › 硬件 › 触控板玩的溜真能比鼠标效率高？ |
自从鼠标坏了就没用过了，感觉不打游啥的用触控板挺方便的，离键盘近双手可以放在键盘上无缝切换
再配上各种 vim 插件，效率比用鼠标高。
再配上各种 vim 插件，效率比用鼠标高。
May 15, 2020 Replied to a topic by guoshim › 程序员 › 返璞归真，回归薄膜键盘 |
用不习惯薄膜键盘...
May 14, 2020 Replied to a topic by zzkde › 问与答 › Hotspot 中一个变量槽应该为多少字节？ |
@1194129822 我去试了 hsdb，但是刚连接上去就报了下面的异常
```
Exception in thread "AWT-EventQueue-0" java.lang.RuntimeException: Unable to deduce type of thread from address 0x00007fc30016f800 (expected type JavaThread, CompilerThread, ServiceThread, JvmtiAgentThread or CodeCacheSweeperThread)
at jdk.hotspot.agent/sun.jvm.hotspot.runtime.Threads.createJavaThreadWrapper(Threads.java:172)
at jdk.hotspot.agent/sun.jvm.hotspot.runtime.Threads.first(Threads.java:156)
at jdk.hotspot.agent/sun.jvm.hotspot.ui.JavaThreadsPanel.cache(JavaThreadsPanel.java:463)
at jdk.hotspot.agent/sun.jvm.hotspot.ui.JavaThreadsPanel.<init>(JavaThreadsPanel.java:89)
at jdk.hotspot.agent/sun.jvm.hotspot.HSDB$45.run(HSDB.java:1380)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Caused by: sun.jvm.hotspot.types.WrongTypeException: No suitable match for type of address 0x00007fc30016f800
at jdk.hotspot.agent/sun.jvm.hotspot.runtime.InstanceConstructor.newWrongTypeException(InstanceConstructor.java:62)
at jdk.hotspot.agent/sun.jvm.hotspot.runtime.VirtualConstructor.instantiateWrapperFor(VirtualConstructor.java:80)
at jdk.hotspot.agent/sun.jvm.hotspot.runtime.Threads.createJavaThreadWrapper(Threads.java:168)
... 17 more
```
我的环境：archliunx 、openjdk8 和 openjdk11 都试过了。是以同一个用户身份运行的。
在网上查询了很久没啥解决方案，不知道大佬怎么解决？
```
Exception in thread "AWT-EventQueue-0" java.lang.RuntimeException: Unable to deduce type of thread from address 0x00007fc30016f800 (expected type JavaThread, CompilerThread, ServiceThread, JvmtiAgentThread or CodeCacheSweeperThread)
at jdk.hotspot.agent/sun.jvm.hotspot.runtime.Threads.createJavaThreadWrapper(Threads.java:172)
at jdk.hotspot.agent/sun.jvm.hotspot.runtime.Threads.first(Threads.java:156)
at jdk.hotspot.agent/sun.jvm.hotspot.ui.JavaThreadsPanel.cache(JavaThreadsPanel.java:463)
at jdk.hotspot.agent/sun.jvm.hotspot.ui.JavaThreadsPanel.<init>(JavaThreadsPanel.java:89)
at jdk.hotspot.agent/sun.jvm.hotspot.HSDB$45.run(HSDB.java:1380)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Caused by: sun.jvm.hotspot.types.WrongTypeException: No suitable match for type of address 0x00007fc30016f800
at jdk.hotspot.agent/sun.jvm.hotspot.runtime.InstanceConstructor.newWrongTypeException(InstanceConstructor.java:62)
at jdk.hotspot.agent/sun.jvm.hotspot.runtime.VirtualConstructor.instantiateWrapperFor(VirtualConstructor.java:80)
at jdk.hotspot.agent/sun.jvm.hotspot.runtime.Threads.createJavaThreadWrapper(Threads.java:168)
... 17 more
```
我的环境：archliunx 、openjdk8 和 openjdk11 都试过了。是以同一个用户身份运行的。
在网上查询了很久没啥解决方案，不知道大佬怎么解决？
May 7, 2020 Replied to a topic by xhf1024 › Java › 大家来探讨一下 Java 方法执行问题！ |
CountDownLatch 或者 CyclicBarrier ？
Apr 30, 2020 Replied to a topic by amiwrong123 › Java › ThreadLocalMap 的源码看起来会考虑一种哈希冲突的情况，但不是 ThreadLocal 本身实现了完美散列吗？ |
@amiwrong123 就算能扩容也要考虑删除情况啊，比如 len 为 16 时：
0 7 14 5 12 3 10 1 8 15 6 13 4 11 2 9 0，可以看到第 17 个 hash 值会冲突
如果单纯添加元素不删除的话到第 17 个元素也不会产生冲突，因为会扩容。
但如果考虑另外一种情况就是我先添加第一个，然后后面边添加边删除，到第 17 个就会产生冲突，但此时 size 为 2，不会扩容。
0 7 14 5 12 3 10 1 8 15 6 13 4 11 2 9 0，可以看到第 17 个 hash 值会冲突
如果单纯添加元素不删除的话到第 17 个元素也不会产生冲突，因为会扩容。
但如果考虑另外一种情况就是我先添加第一个，然后后面边添加边删除，到第 17 个就会产生冲突，但此时 size 为 2，不会扩容。
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